Cannot Unconfigure a CPU Before All Memory is Unconfigured (Midrange Only)

All memory on a system board must be unconfigured before you try to unconfigure a CPU. If you try to unconfigure a CPU before all memory on the board is unconfigured, the system displays an error message such as:

Unable to Unconfigure Memory on a Board With Permanent Memory

To unconfigure the memory on a board that has permanent memory, move the permanent memory pages to another board that has enough available memory to hold them. Such an additional board must be available before the unconfigure operation begins.

Memory Cannot Be Reconfigured

If the unconfigure operation fails with a message such as the following, the memory on the board could not be unconfigured:

Unable to Unconfigure a CPU

CPU unconfiguration is part of the unconfiguration operation for a
system board. If the operation fails to take the CPU offline, the following message is logged to the console:

WARNING: Processor number failed to offline.

This failure occurs if:

The CPU has processes bound to it.

The CPU is the last one in a CPU set.

The CPU is the last online CPU in the system.

Unable to Disconnect a Board

It is possible to unconfigure a board and then discover that it cannot be disconnected. The cfgadm status display lists the board as not detachable. This problem occurs when the board is supplying an essential hardware service that cannot be relocated to an alternate board.

I/O Board Unconfiguration Failure

A device cannot be unconfigured or disconnected while it is in use. Many failures to unconfigure I/O boards occur because activity on the boards has not been stopped, or because an I/O device becomes active again after it has been stopped.

Device Busy

Disks attached to an I/O board must be idled before you attempt to unconfigure or disconnect that board. Any attempt to unconfigure/disconnect a board whose devices are still in use is rejected.

If an unconfiguration operation fails because an I/O board has a busy or open device, the board is left only partially unconfigured. The operation sequence stopped at the busy device.

To regain access to the devices that were not unconfigured, the board must be completely unconfigured, then reconfigured.

If a device on the board is busy, the system logs a message such as the following after an attempt to unconfigure:

To continue the unconfigure operation, unmount the device and retry the unconfigure operation. The board must be in the unconfigured state before you try to reconfigure this board.

Problems with I/O Devices

1. Use the fuser(1M) command to identify the processes that have these devices open.

2. Kill the vold daemon gracefully.

# /etc/init.d/volmgt stop

3. Disconnect all SCSI controllers that are associated with the card you are trying to unconfigure.

To get a list of all connected SCSI controllers use the following command.

# cfgadm -l -s "select=class(scsi)"

4. If the redundancy features of Solaris Volume Manager mirroring are used to access a device connected to the board, reconfigure these subsystems so that the device or network is accessible by way of controllers on other system boards.

Solaris Volume Manager by default uses a private region on each device that it controls, so such devices must be removed from Solaris Volume Manager control before they can be detached.

8. Remove disk partitions from the swap configuration.

9. Either kill any process that directly opens a device or raw partition, or direct it to close the open device on the board.

Note - Unmounting file systems might affect NFS client systems.

RPC or TCP Time-out or Loss of Connection

Time-outs occur by default after two minutes. Administrators might need to increase this time-out value to avoid time-outs during a DR-induced operating system quiescence, which might take longer than two minutes. Quiescing a system makes the system and related network services unavailable for a period of time that can exceed two minutes. These changes affect both the client and server machines.

Configure Operation Failure

Memory Configuration Failure (Midrange Only)

Before configuring memory, all CPUs on the system board must be configured. If you try to configure memory while one or more CPUs are unconfigured, the system displays an error message such as:

I/O Board Configuration Failure

A configure operation might fail because an I/O board with a device does not currently support hot-plugging. In such a situation, the board is now only partially configured. The operation has stopped at the unsupported device. In this situation, the board must be brought back to the unconfigured state before another configure attempt. The system logs a message, such as: